Celestial Navigation · Time — Chronometer Rate
A chronometer's daily 'rate' is used to:
- AProject the known chronometer error forward to the GMT of a later sight✓ Correct
- BConvert arc to time
- CCorrect the sextant for index error
- DFind the equation of time
Explanation
A chronometer is not reset; instead its error on GMT is determined by time signal and its daily rate (gain or loss per day) is tracked. To time a sight, the navigator applies the accumulated error — original error plus rate times the number of days elapsed — to the chronometer reading to obtain GMT.
Authority: Bowditch (Pub. No. 9), Time and Chronometers
Practice the full Celestial Navigation bank
Free spaced-repetition quizzing across 2190 USCG exam questions — it schedules your reviews so the ones you miss come back until they stick.
Related Celestial Navigation questions
- Time
The Nautical Almanac tabulates the positions of celestial bodies against which time standard?
- Time
A vessel in west longitude has a zone description of +5. To convert zone time to UT you must:
- Coordinates
How is the GHA of a star obtained from the Nautical Almanac?
- Coordinates
Sidereal Hour Angle (SHA) is best defined as:
- Coordinates
Declination of a celestial body is the celestial equivalent of:
- The Nautical Almanac
Approximately how fast does the GHA of the Sun increase with time?